Division of Kidney and Hypertension, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan

Correspondence: Dr. Keitaro Yokoyama, Division of Kidney and Hypertension, Department of Internal Medicine, Jikei University School of Medicine Tokyo, Japan, 3-25-8 Nishishinbashi Minato-ku Tokyo Japan, 1058471. Phone: +813-3433-1111; Fax: +813-3433-4297; E-mail: [email protected]